How to use the calculator
- Enter the focal length of your camera lens in millimeters (mm).
- Enter the image circle diameter of your lens in millimeters (mm). This is typically provided by the lens manufacturer.
- Click the "Calculate" button to compute the focal plane distance.
- The result will be displayed in millimeters (mm).
Working Principle
The focal plane distance is the distance from the optical center of the lens to the image sensor or film plane. For many lenses, especially those designed for digital cameras, this distance is approximately half the image circle diameter. This calculator provides a simplified calculation based on this approximation.
Important Notes
- This calculator assumes a simplified model and may not be accurate for all types of lenses, particularly those with non-standard designs.
- For more precise calculations, consult the lens specifications or manual provided by the manufacturer.
- The image circle diameter is typically specified for 35mm equivalent format, so ensure your measurements are consistent with your camera system.